The Satellite input tab is where all of the Satellite information of a via satellite QSO should be entered.
You will select the Satellite that was used to do the QSO, the UpLink and DownLink bands and frequencies and the mode, if needed.
In case you need to log a QSO using a Satellite that KLog is still not supporting, you can always select *Other* in the comboBox. That will enable the text box so you can enter the name of the used Satellite.
Don't forget to contact the KLog development team so we can add the missing satellite or if you want to support, you can simply modify the Sats.dat file, add or correct the data of the satellite and import it again to your KLog and send it back to the KLog development team so your data is available to the public.